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<?php
declare(strict_types=1);
namespace PHPHtmlParser\Dom;
use PHPHtmlParser\Contracts\Dom\CleanerInterface;
use PHPHtmlParser\Exceptions\LogicalException;
use PHPHtmlParser\Options;
class Cleaner implements CleanerInterface
{
/**
* Cleans the html of any none-html information.
*
* @throws LogicalException
*/
public function clean(string $str, Options $options, string $defaultCharset): string
{
if (!$options->isCleanupInput()) {
// skip entire cleanup step
return $str;
}
// check if the string is gziped
$is_gzip = 0 === \mb_strpos($str, "\x1f" . "\x8b" . "\x08", 0, 'US-ASCII');
if ($is_gzip) {
$str = \gzdecode($str);
if ($str === false) {
throw new LogicalException('gzdecode returned false. Error when trying to decode the string.');
}
}
// we must handle character encoding
$str = $this->setUpRegexEncoding($str, $options, $defaultCharset);
// remove white space before closing tags
$str = \mb_eregi_replace("'\s+>", "'>", $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to clean single quotes.');
}
$str = \mb_eregi_replace('"\s+>', '">', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to clean double quotes.');
}
// clean out the \n\r
$replace = ' ';
if ($options->isPreserveLineBreaks()) {
$replace = ' ';
}
$str = \str_replace(["\r\n", "\r", "\n"], $replace, $str);
if ($str === false) {
throw new LogicalException('str_replace returned false instead of a string. Error when attempting to clean input string.');
}
// strip the doctype
$str = \mb_eregi_replace('<!doctype(.*?)>', '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to strip the doctype.');
}
// strip out comments
$str = \mb_eregi_replace('<!--(.*?)-->', '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to strip comments.');
}
// strip out cdata
$str = \mb_eregi_replace("<!\[CDATA\[(.*?)\]\]>", '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to strip out cdata.');
}
// strip out <script> tags
if ($options->isRemoveScripts()) {
$str = \mb_eregi_replace("<\s*script[^>]*[^/]>(.*?)<\s*/\s*script\s*>", '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to remove scripts 1.');
}
$str = \mb_eregi_replace("<\s*script\s*>(.*?)<\s*/\s*script\s*>", '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to remove scripts 2.');
}
}
// strip out <style> tags
if ($options->isRemoveStyles()) {
$str = \mb_eregi_replace("<\s*style[^>]*[^/]>(.*?)<\s*/\s*style\s*>", '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to strip out style tags 1.');
}
$str = \mb_eregi_replace("<\s*style\s*>(.*?)<\s*/\s*style\s*>", '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to strip out style tags 2.');
}
}
// strip smarty scripts
if ($options->isRemoveSmartyScripts()) {
$str = \mb_eregi_replace("(\{\w)(.*?)(\})", '', $str);
if ($str === false) {
throw new LogicalException('mb_eregi_replace returned false instead of a string. Error when attempting to remove smarty scripts.');
}
}
return $str;
}
/**
* Sets up the mb_regex_encoding and converts the text to that encoding.
*
* @throws LogicalException
*/
private function setUpRegexEncoding(string $str, Options $options, string $defaultCharset): string
{
$encoding = $defaultCharset;
$enforceEncoding = $options->getEnforceEncoding();
if ($enforceEncoding !== null) {
// they want to enforce the given encoding
$encoding = $enforceEncoding;
}
if (!\mb_regex_encoding($encoding)) {
throw new LogicalException('Character encoding was not able to be changed to ' . $encoding . '.');
}
return \mb_convert_encoding($str, $encoding);
}
}